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Lewis and Clark leave St. Louis
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Lewis and Clark hire Toussaint Charbonneau as a guide and he and his wife Sacajawea join the party Read more: http://wiki.answers.com/Q/What_are_some_important_dates_of_the_Lewis_and_Clark_expedition
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Sacajawea gives birth to her son, Jean Baptist
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The expedition lands at the mouth of the Columbia River, Astoria,Oregon
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The expedition group begins its way home
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The expedition splits into two teams
So Lewis could go explore the Marias river. -
The expedition team reunites at the Yellowstone and Missouri Rivers
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The expedition team arrives back in St. Louis